Hello Mila,
Thank you for purchasing and using our EShop extension. Ask Question is only available since version 1.1.10 of EShop. Please update EShop on your site to latest version 1.2.4.
Also, Admin has option to turn Ask Question ON/OFF (EShop->System->Configuration->Options tab), please make sure that it is turned on.
Hope that my answer is useful for you. Don't hesitate to let me know if you need any more helps.
Sincerely, Giang